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New 40Ar/39Ar age of granitic rocks and related gold mineralization at the Kirovskoye deposit (southeastern margin of the North Asian craton) |
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| Authors: | A. A. Sorokin A. V. Ponomarchuk A. V. Travin V. A. Ponomarchuk K. D. Vakhtomin |
| Affiliation: | 1. Institute of Geology and Management of Natural Resources, Far East Branch, Russian Academy of Sciences, Blagoveshchensk, Russia 2. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 3. Tomsk State University, Tomsk, Russia |
| Abstract: | The Kirovskoye gold deposit located in the southern part of the Selenga-Stanovoi superterrane at the southeastern margin of the Siberian craton is one of the largest ore deposits in the eastern regions of the Russian Far East. 40Ar/39Ar geochronological studies revealed that the age of the quartz-diorite-porphyrite and granodiorite-porphyry dikes is 128?126 Ma. This estimate agrees with the previous U-Pb age of 125 ± 2 Ma for the Dzhalinda granodiorites. The age of hydrothermal ore-forming processes was estimated at ～121?120 Ma. These results allow us to infer that a relationship between Kirovskoye gold mineralization was formed as a result of postmagmatic hydrothermal activity, which accompanied the emplacement of the Dzhalinda intrusion and coeval dikes. |
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